User Manual

ARC / CIRCLE EXAMPLES
Arc Length — Degree and Diameter Known
Find the Arc length of an 85° portion of a Circle with a 5-Foot
Diameter:
KEYSTROKE DISPLAY
o o 0.
5 f C DIA 5 FEET 0 INCH
8 5 Ç C ARC 85.00°
C ARC 3 FEET 8-1/2 INCH
Arc Length — Degree and Radius Known
Find the Arc length of a Circle with a 24-Inch Radius and 77° of Arc
(77° of 360° Circle):
KEYSTROKE DISPLAY
o o 0.
2 4 i Ç p (Segment Radius) RAD 24 INCH
7 7 Ç C ARC 77.00°
C ARC 32-1/4 INCH
Using ArcK to Calculate an Arc Length
Using the ArcK constant (0.017453), calculate the Arc length given
100° of a one-unit Circle. The Radius is 5 Feet.
KEYSTROKE DISPLAY
1. Enter Degrees and multiply:
oo 0.
10 0x 100.
2. Enter Radius and multiply:
5f x 500 FEET 0 INCH
3. Recall ArcK:
Ç π ARCK 0.017453
4. Calculate Arc Length:
= 8 FEET 8-3/4 INCH
Note: ArcK is
equivalent to the constant of a 1° Arc angle for a one-unit value.
It may be multipled with a Unitless, Linear, Square or Cubic value. The formula for
ArcK is π/180.
78 — SHEET METAL/HVAC PRO CALC